如何可能生成一个随机的,唯一的字符串使用数字和字母用于验证链接?就像你在一个网站上创建了一个账户,它会给你发一封带有链接的电子邮件,你必须点击那个链接才能验证你的账户
如何使用PHP生成其中一个?
如何可能生成一个随机的,唯一的字符串使用数字和字母用于验证链接?就像你在一个网站上创建了一个账户,它会给你发一封带有链接的电子邮件,你必须点击那个链接才能验证你的账户
如何使用PHP生成其中一个?
当前回答
function codeGenerate() {
$randCode = (string)mt_rand(1000,9999);
$randChar = rand(65,90);
$randInx = rand(0,3);
$randCode[$randInx] = chr($randChar);
return $randCode;
}
echo codeGenerate();
输出
38I7
33V7
E836
736U
其他回答
<?php
function generateRandomString($length = 11) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, $charactersLength - 1)];
}
return $randomString;
}
?>
上面的函数将生成一个随机字符串,长度为11个字符。
一个简单的解决方案是通过丢弃非字母数字字符将64进制转换为字母数字。
它使用random_bytes()来获得加密安全的结果。
function random_alphanumeric(int $length): string
{
$result='';
do
{
//Base 64 produces 4 characters for each 3 bytes, so most times this will give enough bytes in a single pass
$bytes=random_bytes(($length+3-strlen($result))*2);
//Discard non-alhpanumeric characters
$result.=str_replace(['/','+','='],['','',''],base64_encode($bytes));
//Keep adding characters until the string is long enough
//Add a few extra because the last 2 or 3 characters of a base 64 string tend to be less diverse
}while(strlen($result)<$length+3);
return substr($result,0,$length);
}
编辑:我只是重新审视了一下,因为我需要一些更灵活的东西。这里有一个解决方案,执行得比上面的好一点,并提供了指定ASCII字符集的任何子集的选项:
<?php
class RandomText
{
protected
$allowedChars,
//Maximum index to use
$allowedCount,
//Index values will be taken from a pool of this size
//It is a power of 2 to keep the distribution of values even
$distributionSize,
//This many characters will be generated for each output character
$ratio;
/**
* @param string $allowedChars characters to choose from
*/
public function __construct(string $allowedChars)
{
$this->allowedCount = strlen($allowedChars);
if($this->allowedCount < 1 || $this->allowedCount > 256) throw new \Exception('At least 1 and no more than 256 allowed character(s) must be specified.');
$this->allowedChars = $allowedChars;
//Find the power of 2 equal or greater than the number of allowed characters
$this->distributionSize = pow(2,ceil(log($this->allowedCount, 2)));
//Generating random bytes is the expensive part of this algorithm
//In most cases some will be wasted so it is helpful to produce some extras, but not too many
//On average, this is how many characters needed to produce 1 character in the allowed set
//50% of the time, more characters will be needed. My tests have shown this to perform well.
$this->ratio = $this->distributionSize / $this->allowedCount;
}
/**
* @param int $length string length of required result
* @return string random text
*/
public function get(int $length) : string
{
if($length < 1) throw new \Exception('$length must be >= 1.');
$result = '';
//Keep track of result length to prevent having to compute strlen()
$l = 0;
$indices = null;
$i = null;
do
{
//Bytes will be used to index the character set. Convert to integers.
$indices = unpack('C*', random_bytes(ceil(($length - $l) * $this->ratio)));
foreach($indices as $i)
{
//Reduce to the smallest range that gives an even distribution
$i %= $this->distributionSize;
//If the index is within the range of characters, add one char to the string
if($i < $this->allowedCount)
{
$l++;
$result .= $this->allowedChars[$i];
}
if($l >= $length) break;
}
}while($l < $length);
return $result;
}
}
生成一个随机数使用 你最喜欢的随机数 发电机 乘除 得到一个与数字匹配的数字 你的代码字母表中的字符 将该索引处的项插入 你的代码字母。 重复1),直到你有你想要的长度 想要
例如(伪代码)
int myInt = random(0, numcharacters)
char[] codealphabet = 'ABCDEF12345'
char random = codealphabet[i]
repeat until long enough
这里是终极唯一id生成器。我做的。
<?php
$d=date ("d");
$m=date ("m");
$y=date ("Y");
$t=time();
$dmt=$d+$m+$y+$t;
$ran= rand(0,10000000);
$dmtran= $dmt+$ran;
$un= uniqid();
$dmtun = $dmt.$un;
$mdun = md5($dmtran.$un);
$sort=substr($mdun, 16); // if you want sort length code.
echo $mdun;
?>
你可以为你的id回显任何'var'。但是$mdun更好,你可以将md5替换为sha1以获得更好的代码,但这会很长,可能你不需要。
谢谢你!
我用了这样一句话:
base64_encode(openssl_random_pseudo_bytes(3 * ($length >> 2)));
其中length是所需字符串的长度(能被4整除,否则它会四舍五入到最接近的能被4整除的数字)